We've had a lot of spam issues in the last couple of years and at some times it's been downright ridiculous. I've taken a couple of new steps to try and prevent it (along with banning huge amounts of IP's that our outside of North America).
With it, I left the 'requires moderation' setting to ON for a number of weeks just prior to the upgrade. Well, I've been trying to go through them but theirs just so many registrations I can't make heads or tails of who is legit and who is a fraud. As such, I'm just going to purge them all and have you re-register.
So please, if you've registered in the last month and haven't gotten approved, please re-register. My sincere apologies for the inconvenience. Blame the dirty spammers selling you member enlargements and stealing your worldwide bandwidth.